splApache-2.0from splunk/security_content

Windows Default Group Policy Object Modified with GPME

The following analytic detects modifications to default Group Policy Objects (GPOs) using the Group Policy Management Editor (GPME). It leverages the Endpoint data model to identify processes where `mmc.exe` executes `gpme.msc` with specific GUIDs related to default GPOs. This activity is significant because default GPOs, such as the `Default Domain Controllers Policy` and `Default Domain Policy`, are critical for enforcing security policies across the domain. If malicious, such modifications could allow an attacker to gain further access, establish persistence, or deploy malware across numerous hosts, severely compromising the network's security.

Quality

FP risk

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Rule sourcedetections/endpoint/windows_default_group_policy_object_modified_with_gpme.yml

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes
  WHERE Processes.process_name=mmc.exe (Processes.process =*gpme.msc*)
    AND
    (Processes.process = "*31B2F340-016D-11D2-945F-00C04FB984F9*"
    OR
    Processes.process = "*6AC1786C-016F-11D2-945F-00C04fB984F9*"  )
  BY Processes.action Processes.dest Processes.original_file_name
     Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
     Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
     Processes.process Processes.process_exec Processes.process_guid
     Processes.process_hash Processes.process_id Processes.process_integrity_level
     Processes.process_name Processes.process_path Processes.user
     Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_default_group_policy_object_modified_with_gpme_filter`